Chattahoochee Riverkeeper is hosting a tour of Lake Lanier aboard the Chota Princess II, a 40-foot catamaran, from 9:30 a.m. to 12:30 p.m. Saturday, Sept. 6. The cruise will leave from Aqualand Marina, 6800 Lights Ferry Road in Flowery Branch, and will be the final Lake Lanier cruise of the year.